Chevrolet Trailblazer Service Manual page 69

3. Remove the drive belt from the pulleys
4. Turn the breaker bar counterclockwise to release the tensioner arm.
To Install:
1. Install the drive belt onto all the pulleys except the drive belt tensioner pulley.
2. Install a 3/8 inch breaker bar onto the drive belt tensioner arm.
3. Turn the breaker bar clockwise.
4. Install the drive belt onto the drive belts tensioner pulley.
5. Turn the breaker bar counterclockwise to release the tensioner arm.